Reed relay assembly and the method of making same

Abstract

A reed relay wherein a glass-encapsulated switch having leads projecting longitudinally from each end is inserted in a longitudinal bore in a bobbin. A cover having a top wall, side walls and end walls is applied to the bobbin. One end wall is slotted to receive one of the leads of the switch. The combination of the bobbin, the cover and the slot capturing one of the leads effects the immobilization of both leads and the switch when the cover is applied. The cover is ultrasonically welded to the bobbin.

I claim: 
     
       1. A reed switch assembly comprising, a bobbin having a coil wound thereon,   said bobbin having a bore therethrough, said bore terminating in a small aperture,   a glass-encased switch having leads projecting from each end, said switch being disposed in said bore with one lead projecting through said aperture,   a cover on said bobbin having a top wall, side walls, and two end walls,   one of said end walls having a slot of substantially the same width as the diameter of said lead, said slot overlying the large end of said bore and receiving said lead wire to immobilize it.   
     
     
       2. A reed switch assembly as in claim 1 in which said other end wall rests against the other lead and clamps it against said small aperture. 
     
     
       3. A reed switch assembly as in claim 1 further comprising, flanges projecting from the ends of said bobbin below said cover,   each said flange having a notch therein to receive a respective lead which is bent downwardly at substantially right angles, thereby further capturing and immobilizing said leads.   
     
     
       4. A reed switch as in claim 1 in which said slot is formed by an upper portion of said end wall and a lower strap portion of said end wall which is spaced downwardly and outwardly from said upper portion thereby creating a slot which is slightly wider than said lead to facilitate introduction of said lead into said slot at an acute angle to said end wall, said slot clamping said lead when said wall is perpendicular to said lead. 
     
     
       5. A reed switch assembly comprising, a bobbin having a bore therethrough,   a glass-encased switch having leads projecting from each end, said switch being disposed in said bore,   said bobbin having a shoulder underlying one of said leads,   a cover on said bobbin having a top wall, side walls and two end walls,   the application of said cover to said bobbin causing an end wall to engage said lead and clamp it against said shoulder substantially immobilizing the lead on said switch.   
     
     
       6. A reed switch assembly as in claim 5 further comprising, a single wrap of insulative tape around said bobbin.   
     
     
       7. A reed switch assembly comprising, a bobbin having a bore therethrough,   a glass-encased switch having leads projecting from each end, said switch being disposed in said bore,   a cover on said bobbin having a top wall, side walls and two end walls,   the application of said cover to said bobbin substantially immobilizing the leads on said switch,   a coil wound on said bobbin,   a pair of coil terminals mounted in said bobbin and having lower ends projecting transversely through said bobbin, said terminals having upper ends connected to said coil and lying transversely along the top of said coil,   the top wall of said cover having an internal longitudinal rib projecting between said upper ends.